package model;

import com.mysql.jdbc.Connection;
import com.mysql.jdbc.PreparedStatement;
import com.mysql.jdbc.jdbc2.optional.MysqlDataSource;

import javax.sql.DataSource;
import java.sql.ResultSet;
import java.sql.SQLException;

public class DBUtil {

    private static volatile DataSource dataSource = null;
    private static DataSource getDataSource(){
        if(dataSource==null) {
            synchronized (DBUtil.class) {
                if (dataSource == null) {
                    dataSource = new MysqlDataSource();
                    ((MysqlDataSource) dataSource).setUrl("jdbc:mysql://127.0.0.1:3306/java109?characterEncoding=utf8&useSSL=false");
                    ((MysqlDataSource) dataSource).setUser("root");
                    ((MysqlDataSource) dataSource).setPassword("123456");
                }
            }
        }
        return dataSource;
    }

    public static Connection geConnection() throws SQLException {
        return (Connection) getDataSource().getConnection();
    }
    public static void close(Connection connection, PreparedStatement preparedStatement, ResultSet resultSet){
        try {
            if(resultSet!=null){
                resultSet.close();
            }
        } catch (SQLException e) {
            throw new RuntimeException(e);
        }
        try {
            if(preparedStatement!=null){
                preparedStatement.close();
            }
        } catch (SQLException e) {
            throw new RuntimeException(e);
        }
        try {
            if(connection!=null){
                connection.close();
            }
        } catch (SQLException e) {
            throw new RuntimeException(e);
        }
    }
}
